On land... Tempest Maguire loves her California coastline home. Surfing the killer waves. Taking care of her brothers and dad. Loving her longtime boyfriend, Mark. But the weight of her secret is pulling her under, toward the ocean's ever-growing call. Among the waves... Tempest's secret? She is half mermaid, a legacy left by her absent mother, who returned to the ocean many years ago. And now Tempest has her own choice to make. Complicating matters is Kona, an enigmatic newcomer whose otherworldly abilities hint at a shared passion and common secrets. Beyond the sea... But there is more at stake besides Tempest's heart and her identity - her life may be in danger too. Because the waters hide a mysterious and dark secret world of their own, one full of sweeping romance and thrilling adventure - but one where nobody, least of all Tempest, is safe.